The Ryoshin also known as the Red Crow ministry is a secretive organization of shinobis and rouge Seigun that used stealth and ninjutsu to assassinate or infiltrate their targets as well as other irredeemable tactics considered forbidden by Seigun Law.  
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The clan's origin is said to be tied to Admiral Snake Fu Bai and his travels to the Tekkanese Islands and the young samurai whose attention was captured by his philosophies and passion for studying foreign cultures. In return, he taught his followers in Tekkan his culture, his arts, and his secrets. These teachings, including Fu Bai's martial tactics as well as their Seigun lineage, would go on to make these samurai lethal and cunning warriors, even to the greatest Seigun masters. But since the arts they've learned were against Seigun law and from a foreigner, they were looked down upon yet allowed to remain their status as long as their services fell upon the shogun and none other. For a time, they operated as stealth units or shinobi under the Seigun to gather intel on suspected enemies and traitors. Yet they were forbidden to kill, despite how easy they could do it, for that was a burden of the samurai who slays only those who they can faithfully look in the eye. This system lived on until 3010 RH when a group of shinobi witnessed a patron of monks and shrine maidens fall victim to slaughter on a mission they were meant to remain unseen and without intervention. Unable to stomach innocent blood staining the floors, the three shinobi leapt from the shadows and unleashed a massacre on the bandits. None were left alive, only their screaming pleas that echoed through the shrine halls. By the time they were finished the entire temple was painted with so much blood that even the flocks of crows caught a few stains of red. Earning their name the Red Crow Ministry. 

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For dishonoring and insulting the Seigun law, the shinobi were immediately discharged from their titles and ordered to commit harakiri to redeem themselves for their wrongdoings. Some complied whereas most chose to escape and forever live in the Seigun's shadow. A shadow that would eventually outlive its owner for they still operate under new management to this day. Not many know of their existence, none know their purpose.